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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93433356f5473eb35acc45a3e01a85c175893f87683953605c70d2a3a924304d' 
  AND token = 'X5JIp1mgVMZg95U0D6d0G9tUpqFus95WgaTUwRSxbk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}